1. It is(has been)estimated that the world's population could reach 6 billion by the end of the century.
2. It must be pointed out that it is one of our basic State policies to control population growth while raising the quality of the population.
3. Upon hearing the unexpected news，he was so surprised that he couldn't utter a word.
4. It's hard to say whether the plan is practicable.
5. It must be kept in mind that there is no secret of success but hard work.
6. As the saying goes，nothing in the world is difficult for one who sets his mind to it.
7. As is known man is the product of labour.
8. It can be seen from this that there is no difficulty in the world we can overcome.
9. It seems certain that they have made a series of experiments.
10. It must be admitted that you haven't done what you promised to do.
11. It is certain that we have a long way to go.
12. It is clear that the enemy has no desire for peace.
13. It is hard to imagine how Edison managed to work twenty hours each
14. There is no doubt that you will be helped by others if you have any difficulties.
15. It is said that bats have been using radar for millions of years.
16. To tell the truth，many mistakes we made could have been avoided.
17. As we know，it was not until recently that the problem was solved.
18. In my opinion，this computer is different from that one you saw.
19. All this shows that nothing can prevent us from reaching our aims.
20. As far as we know，it took him more than a year to write the book.
21. It has been proved that every substance，no matter what it is，made up of atoms.
29. It is true that we must redouble our efforts;otherwise we cannot catch up with the developed countries.
30. I take it for granted that they will support this idea. I regard it as natural that they will agree to this idea.
31. In a certain sense ， a successful scientist is a person who is never satisfied with what he has achieved.
32. It is a common saying that man who has a settled purpose will surely succeed.
33. The oceans do not so much divide the world as unite it.
01 It is vital/ essential/ crucial/ significant for someone to do... 对某人来说，做...是重要要的
It is vital for human beings to take immediate action to protect wild animals.
02 There is little doubt that.. 毫无疑问
There is little doubt that more and more people are moving from rural areas to large cities.
03 be put under threat of 遭受某物的威胁
Citizens are put under threat of getting infected with the virus.
04 Those who... 那些...的人
Those who eat fast food very often tend to gain much more weight.
05 The reason why...is that... 原因是...
The reason why fast food dominates our dining table is that governments fail to protect a nation’s traditional food industry.
06 We must keep in mind that... 我们必须牢记
We must keep in mind that we are not children any more，and we should be independent.
07 enable someone to do... 使某人能够做某事
The new test should enable doctors to detect the disease early.
08 It is no exaggerations to say that 毫不夸张的说
It is no exaggerations to say that university study totally changed my life.
09 Believe it or not 无论信不信
Believe it or not，many fresh graduates of today can hardly to adapt to this competitive society.
10 adjust oneself to 调整自己以便适应
We need to adjust oneselves to the competitive job market.
11 It concerns many parents that... 某事引发了很多父母的担忧
It concerns many parents that some children may be exposed to school bullying.
12 be put under pressure to do... 迫于压力做某事
We need to admit that many of us were put under pressuer to learn。
13 play a key part in... 在某物中起着关键作用
CPU plays a key part in many electrical things such as PC，smart phones and tablets.
14 lay the groundwork for... 为什么...打下基础
Theoretical knowledge we got from schools lays the groundwork for our university study.
15 have no choice but to do... 别无选择，只能做某事
We actually have no chioce but to work hard to earn a living.
16 ...is just a desirable idea rather than an achievable reality. 某事只是一个美好的愿望，而不是一个可以实现的目标
Gender equality is just a desirable idea rather than an achievable reality.
17 ...has/ have considerable influence on 对某物有着巨大的影响
Parents have considerable influence on the behavioral development of children.
18 ...is a subject close to one’s heart ...是某人关心的话题
Teen's puppy love is a subject close to many parten’s heart.
19 arouse one's desire to do...引发某人做..的欲望
TV advertising can arouse our desire to buy someting that looks fashionable.
20 spare no effort to do... 不遗余力的做某事
As President of United States, I’m going to spare no effort to respond to this crisis.
21 take stringent measures to do... 采取严格措施做..
Governments shuold take stringent measures to curb enviromental degradation.
22 Proper measures must be taken to...我 们必须采取适当的措施去做某事
Proper measures must be taken to limit the number of foreign tourists.
23 devote too much energy and time to... 为某人某物投入太多的精力和时间
People of today devote too much energy and time to work。
24 pay a heavy price for 为...付出沉重的代价
Human beings have paid a heavy price for the ignorance of ecological protection.
25 make extraordinary progress in... 在某方面取得了巨大的进步
Human beings have made extraordinary progress in knowledge and technology over the recent decades.
34. It can be said that without knowledge of science and technology，it is impossible to build socialist modernizations.
35. There is no denying the fact that the new management method has greatly increased the production.
36. Now in China，more and more families can afford to buy high-grade goods，such as washing machines，TV sets，videocorders.